Continuous activation of PpIX by daylight is as effective as and less painful than conventional photodynamic therapy for actinic keratoses; a randomized, controlled, single-blinded study

PDT of AK by continuous activation of porphyrins by daylight proved to be as effective as conventional PDT. PDT using daylight activation will make the treatment of these extremely common premalignant tumours more time and cost effective, and more convenient for the patient.